Does anyone have experience fitting a replacement basin to an existing pedestal?

I've only gone and sheered the bottom of a 1950s ceramic (!) basin while trying to replace the waste. I've found one from Wickes (Hamilton range) that looks similar but I don't want to use their pedestal as
a) I'd have to pay for it
b) it's ugly as sin
c) the carpet is cut to the footprint of the existing pedestal

What are my chances of getting one that fits the 1950s pedestal?